Message ID | 20240820235730.2852400-8-Liam.Howlett@oracle.com (mailing list archive) |
---|---|
State | New |
Headers | show
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Howlett" <Liam.Howlett@oracle.com> To: Andrew Morton <akpm@linux-foundation.org> Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Suren Baghdasaryan <surenb@google.com>, Lorenzo Stoakes <lorenzo.stoakes@oracle.com>, Matthew Wilcox <willy@infradead.org>, Vlastimil Babka <vbabka@suse.cz>, sidhartha.kumar@oracle.com, Bert Karwatzki <spasswolf@web.de>, Jiri Olsa <olsajiri@gmail.com>, Kees Cook <kees@kernel.org>, "Paul E . McKenney" <paulmck@kernel.org>, "Liam R. Howlett" <Liam.Howlett@Oracle.com>, "Liam R . 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Series |
Avoid MAP_FIXED gap exposure
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expand
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diff --git a/mm/mmap.c b/mm/mmap.c index 30ae4cb5cec9..112f2111c457 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -1796,6 +1796,7 @@ static int do_brk_flags(struct vma_iterator *vmi, struct vm_area_struct *vma, vma_iter_store(vmi, vma); vma_complete(&vp, vmi, mm); + validate_mm(mm); khugepaged_enter_vma(vma, flags); goto out; } diff --git a/mm/vma.c b/mm/vma.c index 7b8b8b983399..5abda4c49c83 100644 --- a/mm/vma.c +++ b/mm/vma.c @@ -269,6 +269,7 @@ static int __split_vma(struct vma_iterator *vmi, struct vm_area_struct *vma, /* vma_complete stores the new vma */ vma_complete(&vp, vmi, vma->vm_mm); + validate_mm(vma->vm_mm); /* Success. */ if (new_below) @@ -548,6 +549,7 @@ int vma_expand(struct vma_iterator *vmi, struct vm_area_struct *vma, vma_iter_store(vmi, vma); vma_complete(&vp, vmi, vma->vm_mm); + validate_mm(vma->vm_mm); return 0; nomem: @@ -589,6 +591,7 @@ int vma_shrink(struct vma_iterator *vmi, struct vm_area_struct *vma, vma_iter_clear(vmi); vma_set_range(vma, start, end, pgoff); vma_complete(&vp, vmi, vma->vm_mm); + validate_mm(vma->vm_mm); return 0; } @@ -668,7 +671,6 @@ void vma_complete(struct vma_prepare *vp, } if (vp->insert && vp->file) uprobe_mmap(vp->insert); - validate_mm(mm); } /* @@ -1200,6 +1202,7 @@ static struct vm_area_struct } vma_complete(&vp, vmi, mm); + validate_mm(mm); khugepaged_enter_vma(res, vm_flags); return res;